diff --git a/pkgs/development/libraries/opentracing-cpp/default.nix b/pkgs/development/libraries/opentracing-cpp/default.nix
index e4bb9bb8ca50..3b0354b9fe8e 100644
--- a/pkgs/development/libraries/opentracing-cpp/default.nix
+++ b/pkgs/development/libraries/opentracing-cpp/default.nix
@@ -1,10 +1,11 @@
 { stdenv, fetchFromGitHub, cmake }:
-stdenv.mkDerivation {
-  name = "opentracing-cpp";
+stdenv.mkDerivation rec {
+  name = "opentracing-cpp-${version}";
+  version = "1.5.0";
   src = fetchFromGitHub {
     owner = "opentracing";
     repo = "opentracing-cpp";
-    rev = "v1.5.0";
+    rev = "v${version}";
     sha256 = "09hxj59vvz1ncbx4iblgfc3b5i74hvb3vx5245bwwwfkx5cnj1gg";
   };
   buildInputs = [ cmake ];